Lecture 19 AC synthesis II

Lecture 19 AC synthesis II - Lecture 19: DC-AC Inverters II...

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Lecture 19: DC-AC Inverters II Phasor analysis
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Full-bridge inverters – Bipolar Switching 0 P1 P1 P2 P2 R1 0.1 L1 4mH IC = -7A V1 200V C2 40uF R3 100 D2 D3 1-V(%IN) PWM_TRI1 fs = 5.5kHz cs D5 D4 V4 in out PWM output switches between +V in and –V in Diagonal switches are controlled together as a pair Higher switching frequency harmonics EEE 472 – Raja Ayyanar
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Bipolar Switching Time 80ms 82ms 84ms 86ms 88ms 90ms 92ms 94ms 96ms 98ms 100ms V(PWM_TRI1.Vtri:+) V(PWM_TRI1.E1:IN+) -1.0V -0.5V 0V 0.5V 1.0V V(PWM_TRI1.E1:OUT+) Frequency 0Hz 0.5KHz 1.0KHz 1.5KHz 2.0KHz 2.5KHz 3.0KHz 3.5KHz 4.0KHz 4.5KHz 5.0KHz V(L1:1,PWR_SWITCH4:in) 50V 100V 150V 200V 2 Bo Ao oA oB o A o v (t)   1 oa i n ˆ Vm V EEE 472 – Raja Ayyanar
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Sinusoidal PWM Sine-triangle comparison Time 80ms 82ms 84ms 86ms 88ms 90ms 92ms 94ms 96ms 98ms 100ms V(PWM_TRI1.Vtri:+) V(PWM_TRI1.E1:IN+) -1.0V -0.5V 0V 0.5V 1.0V  1 0 ct r i r i qt i fv v if v v   c a tri ˆ V m ˆ V Amplitude modulation ratio 2 cc m ˆ vV s i n ( f t ) m f mod ulating frequency c f
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This note was uploaded on 05/25/2011 for the course EE 472 taught by Professor Ayynar during the Spring '11 term at ASU.

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Lecture 19 AC synthesis II - Lecture 19: DC-AC Inverters II...

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